linux-kernel - Re: [patch 1/3] mm: embed the memcg pointer directly into struct page

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Message-ID: <20141103080208.GA7052@js1304-P5Q-DELUXE>
Date:	Mon, 3 Nov 2014 17:02:08 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...e.cz>,
	Vladimir Davydov <vdavydov@...allels.com>,
	Tejun Heo <tj@...nel.org>, David Miller <davem@...emloft.net>,
	linux-mm@...ck.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 1/3] mm: embed the memcg pointer directly into struct page

On Sat, Nov 01, 2014 at 11:15:54PM -0400, Johannes Weiner wrote:
> Memory cgroups used to have 5 per-page pointers.  To allow users to
> disable that amount of overhead during runtime, those pointers were
> allocated in a separate array, with a translation layer between them
> and struct page.

Hello, Johannes.

I'd like to leave this translation layer.
Could you just disable that code with #ifdef until next user comes?

In our company, we uses PAGE_OWNER on mm tree which is the feature
saying who allocates the page. To use PAGE_OWNER needs modifying
struct page and then needs re-compile. This re-compile makes us difficult
to use this feature. So, we decide to implement run-time configurable
PAGE_OWNER through page_cgroup's translation layer code. Moreover, with
this infrastructure, I plan to implement some other debugging feature.

Because of my laziness, it didn't submitted to LKML. But, I will
submit it as soon as possible. If the code is removed, I would
copy-and-paste the code, but, it would cause lose of the history on
that code. So if possible, I'd like to leave that code now.

Thanks.
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